Integrated Adrian's comments
Integrated Adrian's comments

Some comments of Adrian should be discussed before changing specs. These include:

- Getting rid of `TxClaimDeposit`
- No differentiation between `SoftwareUpgradeProposal` and `PlainTextProposal`
- Always accept if >2/3 vote `Yes` (which means no `Urgent` proposals anymore)
- Penalize validator automatically
- Enforce `MainKey` and `GovernanceKey` are always different
cosmos/cosmos